本题目来源于试卷: Physics Unit18: Electric Currents，类别为 通用国际物理
[单选题]
A platinum wire is u*;b m: mc1uybbsed to determine the melting poinr;k p:o1trd..ytvi1*xmixg ; ; wov4 kt of indium. The resistance of the platinum wire isd4it1*1 rpr kx vw t.voki:x y;;;o.gm $2.000 \; \Omega$ at $20 ^{\circ}C$ and increases to $3.072 \; \Omega$ as indium starts to melt. What is the melting point of indium? (The temperature coefficient of resistivity for platinum is $3.9 \times 10^{-3} /^{\circ}C$.)
A. $117 ^{\circ}C$
B. $137 ^{\circ}C$
C. $157 ^{\circ}C$
D. $351 ^{\circ}C$
参考答案: C
本题详细解析:
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